核主泵驱动电动机屏蔽套涡流损耗混合算法研究

Research on Hybrid Algorithm of Can Losses in Double Canned Induction Motor for Nuclear Pump

针对大型核主泵驱动用双屏蔽感应电动机定转子屏蔽套涡流损耗计算复杂的问题,提出了一种混合算法,该算法将二维有限元法与解析法相结合解决了屏蔽套涡流损耗计算过程中计算精度与计算速度的矛盾。以有限元二维磁场数值分析为基础,结合麦克斯韦方程组,推导了定转子屏蔽套涡流损耗二维解析模型。以一台兆瓦级核主泵驱动用双屏蔽感应电动机为例,对电动机定转子屏蔽套涡流损耗进行了详细的分析计算,并将计算结果与瞬态磁场分析有限元法的计算进行了对比分析,验证了混合算法的正确性。

The calculation of stator and rotor can losses in large double canned induction motor for nuclear pump was very complicated. In view of this problem, a hybrid algorithm was proposed. The 2-D finite element method and analytic method were combined in the proposed algorithm and the contradiction between the calculation accuracy and calculation speed in the calculation of can losses was solved. In this paper, based on the 2-D numerical analysis of magnetic field, the 2-D analytic models of stator and rotor can losses were derived by combing Maxwell′s equations. Taking a megawatt double canned induction motor for nuclear pump as an example, the stator and rotor can losses were calculated and analyzed in detail, by comparing with the result of transient magnetic finite element method, the correctness of the hybrid algorithm is verified.